CN105731896B - A kind of prefabricated member high-strength concrete and preparation method thereof and maintenance process - Google Patents

A kind of prefabricated member high-strength concrete and preparation method thereof and maintenance process Download PDF

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Publication number
CN105731896B
CN105731896B CN201610074901.4A CN201610074901A CN105731896B CN 105731896 B CN105731896 B CN 105731896B CN 201610074901 A CN201610074901 A CN 201610074901A CN 105731896 B CN105731896 B CN 105731896B
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China
Prior art keywords
concrete
water
steel fibre
reducing agent
slag
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CN201610074901.4A
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CN105731896A (en
Inventor
曾凡贵
黄煌
陈科
陈怡宏
张意
于泽东
段文川
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Chongqing University
Chongqing Construction Engineering Group Co Ltd
Chongqing Construction Residential Engineering Co Ltd
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Chongqing University
Chongqing Construction Engineering Group Co Ltd
Chongqing Construction Residential Engineering Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/02—Selection of the hardening environment
    • C04B40/024—Steam hardening, e.g. in an autoclave
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/006—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

The invention discloses a kind of prefabricated member high-strength concrete and preparation method thereof and maintenance process, each raw material usage is as follows in every cubic meter of concrete：Slag：480~640kg, coarse aggregate：852~969kg, fine aggregate：771~8kg, alkaline constituents：94~126kg, water：93~121kg, steel fibre：0~117kg, active mineral material：0~56kg, water-reducing agent：6.8~9.0kg；Water-reducing agent is high performance water reducing agent of polyocarboxy acid.By adding alkaline constituents, steel fibre, active mineral material and water-reducing agent and using steam-cured technical measures in the present invention so that mechanical property, endurance quality and long-term behaviour for the concrete of prefabricated elements all dramatically increase；So that the practicality higher of prefabricated elements, use scope is more extensive, more preferable using the shock resistance of the building of mounting structure, globality, and the service life of building is longer；And cement instead of using slag in the present invention, add waste resource reuse ratio, have important practical significance.

Description

A kind of prefabricated member high-strength concrete and preparation method thereof and maintenance process
Technical field
The invention belongs to building field, especially a kind of prefabricated member high-strength concrete and preparation method thereof.
Background technology
Building trade is the pillar industry of Chinese national economy, is played the role of to China's expanding economy very important； It is before general in building trade all to use cast-in-place concrete, but with energy scarcity, labour is in short supply and energy conservation and environmental protection will The problems such as asking raising highlights, and building trade encounters very big challenge.The shortcomings that cast-in-place concrete, also embodies more and more brighter Aobvious, site operation during due to cast-in-place concrete, the requirement to construction site is very high, and site operation needs a variety of mechanical equipments, needs The labour wanted is big, and the building waste that construction site produces is more, is not only the construction that building waste also has cast-in-place concrete Process all causes environment undesirable influence, this saving energy advocated with country and material, save labour and environmental protection Thought run counter to.Therefore, as country puts into effect the policy guidance and preferential policy of assembled-type house successively, precast concrete Production application is inevitable trend, but existing precast concrete is compared with cast-in-place concrete, the intensity of precast concrete and Durability works out that can to increase the high-strength concrete of prefabricated assembled component strength and durability be very compared to poor It is urgent and be necessary.
The content of the invention
For the above problem of the prior art, the present invention proposes a kind of preparation side of prefabricated member high-strength concrete Method, the present invention solve it is existing be used to manufacturing prefabricated member concrete strength is low, the skill of durability and long-term behaviour difference Art problem.
The technical scheme is that：A kind of prefabricated member high-strength concrete, per each raw material in cubic meter of concrete Dosage is as follows：Slag：480~640kg, coarse aggregate：852~969kg, fine aggregate：771~876kg, alkaline constituents：94~ 126kg, water：93~121kg, steel fibre：0~117kg, active mineral material：0~56kg, water-reducing agent：6.8~9.0kg；Institute It is high performance water reducing agent of polyocarboxy acid to state water-reducing agent.
Further, a kind of prefabricated member high-strength concrete, often each raw material usage is as follows in cubic meter of concrete：Ore deposit Slag：520~600kg, coarse aggregate：881~939kg, fine aggregate：797~856kg, alkaline constituents：102~118kg, water：100~ 114kg, steel fibre：39~117kg, active mineral material：14~42kg, water-reducing agent：7.4~8.4kg；
Further, the specific surface area of the slag is 456m2/ kg, the density of slag is 2.91~2.92g/cm3。
Further, the coarse aggregate is limestone, quartzite or basaltic one kind, the maximum grain of the coarse aggregate Footpath Dmax=10mm, and coarse aggregate is 5~10mm continuous gradings.
Further, the fine aggregate is middle sand, and the modulus of fineness of middle sand is 2.37.
Further, the alkaline constituents is waterglass, wherein modulus of water glass M=1.25, sodium oxide molybdena equivalent in waterglass Na2O% is 4.0%.
Further, the steel fibre is the micro- steel fibre of copper facing, cold drawn end hooks steel fibre and shears undaform steel fibre It is a kind of.
Further, the active mineral material is silicon ash, and the specific surface area of silicon ash is 20000m2/kg。
The invention also provides a kind of above-mentioned preparation method of prefabricated member high-strength concrete, include the following steps：It is first First coarse aggregate, fine aggregate, slag and active mineral material are added in mixer, are stirred 60s, then with water by alkaline constituents Dissolved, then the aqueous solution dissolved with alkaline constituents is added in mixer, continued to stir 60s, be finally 10mm with aperture Testing sieve steel fibre is sieved into mixer, stir 120s after, complete prefabricated member high-strength concrete preparation.
The invention also provides a kind of above-mentioned maintenance process of prefabricated member high-strength concrete, include the following steps：System Form removal after the concrete sample band mould precuring 24h got ready, then the steam curing 8h under 80 DEG C of temperature conditionss, finally puts test specimen Enter standard curing room maintenance 7d.
Compared with prior art, the beneficial effects of the invention are as follows：
1. cement instead of as cementitious material using slag in the present invention, since slag has higher lateral reactivity, Gel of the hydration reaction generation with the hydraulicity under the action of alkali-activator, has early-strong-fast-hard and high intensity, good Impermeability, low hydration heat, good frost resistance, high corrosion resistance, excellent the steel protection property and superior subzero temperature hardening capacity etc. one Serial excellent performance.
2. using waterglass in the present invention as alkaline constituents, mainly waterglass has duality, and waterglass is considered as The alkali metal silicate salt mixture of NaOH and both cataloids of strong aquation, waterglass can be introduced as alkaline constituents Substantial amounts of activity (SiO4)4-Ion, these ions can participate in hydration reaction rapidly, increase quantity and the polymerization of C-S-H gels Degree, so that the intensity of concrete significantly improves.
3. being added with steel fibre in the present invention, steel fibre is added in concrete can significantly improve concrete strength, especially It is flexural strength, so that steel fibre can hinder the procreation of prefabricated member internal tiny crack, extension, significantly improve mixed Coagulate the toughness and ductility of soil.
4. added with silicon ash as the active mineral material in concrete in the present invention, due to the volcano effect of silicon ash and micro- Gather materials effect so that silicon ash improves the compression strength and flexural strength of slag.
5. being added with high performance water reducing agent of polyocarboxy acid in the present invention, in the case where water-cement ratio is constant, concrete is added Workability；Keeping mobility constant and in the case that slag dosage is constant, the 10%-20% of batched water can be reduced, from And reduce the water-cement ratio of concrete so that the intensity of concrete improves 15%-20%, and particularly early strength of concrete improves It is more notable；Water-reducing agent can improve the compactness of concrete, water penetration reduce, so as to improve concrete it is impervious, Freeze proof, resist chemical and anti-corrosion can, therefore significantly improve the durability and chronicity of concrete.
Embodiment
The technical solution in the present invention is further illustrated with reference to embodiment.
Embodiment 1
A kind of prefabricated member high-strength concrete, often each raw material usage is as follows in cubic meter of concrete：Slag：480kg, Basalt：969kg, middle sand：876kg, waterglass：94kg, water：93kg, the micro- steel fibre of copper facing：98kg, silicon ash：28kg, poly- carboxylic Sour high-performance water reducing agent：6.8kg；Wherein the specific surface area of slag is 456m2/ kg, the density of slag is 2.91~2.92g/cm3。 Basaltic maximum particle diameter Dmax=10mm, and basalt is 5~10mm continuous gradings.The modulus of fineness of middle sand is 2.37, mistake 4.75 sieves, apparent density 2687kg/m3, bulk density 1642kg/m3, clay content 1.0%.Modulus of water glass M= 1.25, sodium oxide molybdena equivalent Na in waterglass2O% is 4.0%.The draw ratio of the micro- steel fibre of copper facing is 65.The specific surface area of silicon ash For 20000m2/kg。
A kind of preparation method of prefabricated member high-strength concrete, includes the following steps：First by basalt, middle sand, ore deposit Slag and silicon ash are added in mixer, are stirred 60s, then are dissolved waterglass with water, then by dissolved with waterglass Aqueous solution is added in mixer, is continued to stir 60s, is finally sieved into the micro- steel fibre of copper facing with the testing sieve that aperture is 10mm and stirs Mix in machine, after stirring 120s, complete the preparation of prefabricated member high-strength concrete.
A kind of maintenance process of prefabricated member high-strength concrete, includes the following steps：The concrete sample band prepared Form removal after mould precuring 24h, then the steam curing 8h under 80 DEG C of temperature conditionss, finally inserts standard curing room maintenance by test specimen 7d。
Embodiment 2
A kind of prefabricated member high-strength concrete, often each raw material usage is as follows in cubic meter of concrete：Slag：520kg, Basalt：939kg, middle sand：850kg, waterglass：102kg, water：100kg, the micro- steel fibre of copper facing：98kg, silicon ash：28kg, gathers Carboxylic acid high-performance water reducing agent：7.4kg.Remainder is the same as embodiment 1.
Embodiment 3
A kind of prefabricated member high-strength concrete, often each raw material usage is as follows in cubic meter of concrete：Slag：560kg, Basalt：911kg, middle sand：825kg, waterglass：110kg, water：107kg, the micro- steel fibre of copper facing：98kg, silicon ash：28kg, gathers Carboxylic acid high-performance water reducing agent：7.9kg.Remainder is the same as embodiment 1.
Embodiment 4
A kind of prefabricated member high-strength concrete, often each raw material usage is as follows in cubic meter of concrete：Slag：600kg, Basalt：881kg, middle sand：797kg, waterglass：118kg, water：114kg, the micro- steel fibre of copper facing：98kg, silicon ash：28kg, gathers Carboxylic acid high-performance water reducing agent：8.4kg.Remainder is the same as embodiment 1.
Embodiment 5
A kind of prefabricated member high-strength concrete, often each raw material usage is as follows in cubic meter of concrete：Slag：640kg, Basalt：852kg, middle sand：771kg, waterglass：126kg, water：121kg, the micro- steel fibre of copper facing：98kg, silicon ash：28kg, gathers Carboxylic acid high-performance water reducing agent：9.0kg.Remainder is the same as embodiment 1.
Slag dosage is controlled by above example 1-5, concrete anti-compression, flexural strength are studied, draw subordinate list One.
Subordinate list one：Influence of the slag dosage to concrete anti-compression, flexural strength
As can be seen from the above table, as the increase of slag dosage, the compression strength and flexural strength of concrete all substantially increase Add, but when the dosage of slag increases to more than 600kg, the compression strength of concrete and the amplification unobvious of flexural strength, Economically, select 560~600kg slag dosages more excellent.
Embodiment 6
Concrete raw material, concrete prepare and maintenance process is same as Example 3, unlike：Slag：588kg, silicon Ash：0kg.
Embodiment 7
Concrete raw material, concrete prepare and maintenance process is same as Example 3, unlike：Slag：574kg, silicon Ash：14kg.
Embodiment 8
Concrete raw material, concrete prepare and maintenance process is same as Example 3, unlike：Slag：546kg, silicon Ash：42kg.
Embodiment 9
Concrete raw material, concrete prepare and maintenance process is same as Example 3, unlike：Slag：532kg, silicon Ash：56kg.
Silicon ash dosage is controlled by above example 3,6-9, concrete anti-compression, flexural strength are studied, drawn attached Table two.
Subordinate list two：Influence of the silicon ash dosage to concrete anti-compression, flexural strength
As can be seen from the above table, with the increase of silicon ash dosage, the intensity first increases and then decreases of concrete, every cubic metre mixed When the dosage of solidifying soil silicon ash is 28kg, the compression strength of concrete is added compared to the concrete crushing strength for being not added with silicon ash 2.5%, caused by the volcano effect and micro aggregate effect of silicon ash, suitable silicon ash has one to the compression strength of slag concrete Fixed facilitation.
Embodiment 10
Concrete raw material, concrete prepare and maintenance process is same as Example 3, unlike：The micro- steel fibre of copper facing： 0kg。
Embodiment 11
Concrete raw material, concrete prepare and maintenance process is same as Example 3, unlike：The micro- steel fibre of copper facing： 39kg。
Embodiment 12
Concrete raw material, concrete prepare and maintenance process is same as Example 3, unlike：The micro- steel fibre of copper facing： 78kg。
Embodiment 13
Concrete raw material, concrete prepare and maintenance process is same as Example 3, unlike：The micro- steel fibre of copper facing： 117kg。
The micro- dosage of steel fiber of copper facing is controlled by above example 3,10-13, concrete anti-compression, flexural strength are ground Study carefully, draw subordinate list three.
Subordinate list three, influence of the micro- dosage of steel fiber of copper facing to concrete anti-compression, flexural strength
As can be seen from the above table, with the dosage increase of the micro- steel fibre of copper facing, the compression strength and flexural strength of concrete Obvious increase, it is contemplated that the micro- steel fibre of copper facing adds the excessive internal friction that can increase mixture in concrete, and meeting The part mixing water in mixture is spent, so as to influence the mobility of concrete, along with economically considering, copper facing The dosage of micro- steel fibre is that 98kg is optimal.
Embodiment 14
Concrete formulation, concrete prepare and maintenance process is same as Example 3, unlike：Basalt is changed into lime Rock.
Embodiment 15
Concrete formulation, concrete prepare and maintenance process is same as Example 3, unlike：Basalt is changed into quartz Rock.
Influence of the species of concrete rough aggregate to concrete anti-compression, flexural strength is studied by above-described embodiment 14,15, Draw following subordinate list four.
Subordinate list four：Influence of the coarse aggregate species to concrete anti-compression, flexural strength
It can be drawn by upper table, to the compression strength and High anti bending strength of quartzite and limestone, this is mainly basalt Using basalt as coarse aggregate so that concrete end face gathers materials, and destruction is less, and basalt exterior appearance is irregular geometric form Body, rough surface forms good bonding with cementitious material, therefore the intensity for the concrete prepared using basalt is higher, because Using basalt as optimal coarse aggregate in this present invention.
Embodiment 16
Concrete formulation, concrete prepare and maintenance process is same as Example 3, unlike：The micro- steel fibre of copper facing becomes Steel fibre is hooked for cold drawn end.
Embodiment 17
Concrete formulation, concrete prepare and maintenance process is same as Example 3, unlike：The micro- steel fibre of copper facing becomes To shear undaform steel fibre.
By the influence of above-described embodiment 16,17 Study on Steel kinds of fibers to concrete anti-compression, flexural strength, subordinate list is drawn Five.
Subordinate list five：Influence of the steel fibre species to concrete strength
As can be seen from the above table, the micro- steel fibre of copper facing hooks steel fibre compared to cold drawn end and shearing undaform steel fibre can be bright The resistance to compression of aobvious increase concrete, flexural strength, select the micro- steel fibre of copper facing as optimal steel fiber material in of the invention.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention With within principle, any modification, equivalent replacement, improvement and so on, should all be included in the protection scope of the present invention god.

Claims (5)

1. a kind of prefabricated member high-strength concrete, it is characterised in that each raw material usage is as follows in per cubic meter of concrete：Ore deposit Slag：520~600kg, coarse aggregate：881~939kg, fine aggregate：797~856kg, alkaline constituents：102~118kg, water：100~ 114kg, steel fibre：39~117kg, active mineral material：14~42kg, water-reducing agent：7.4~8.4kg；The water-reducing agent is poly- Carboxylic acid high-performance water reducing agent；
Wherein described coarse aggregate is limestone, quartzite or basaltic one kind, the maximum particle diameter D of the coarse aggregatemax= 10mm, and coarse aggregate is 5~10mm continuous gradings；The fine aggregate is middle sand, and the modulus of fineness of middle sand is 2.37；The activity Mineral material is silicon ash, and the specific surface area of silicon ash is 20000m2/kg。
A kind of 2. prefabricated member high-strength concrete as claimed in claim 1, it is characterised in that：The specific surface area of the slag For 456m2/ kg, the density of slag is 2.91~2.92g/cm3。
A kind of 3. prefabricated member high-strength concrete as claimed in claim 1, it is characterised in that：The alkaline constituents is water glass Glass, wherein modulus of water glass M=1.25, sodium oxide molybdena equivalent Na in waterglass2O% is 4.0%.
A kind of 4. prefabricated member high-strength concrete as claimed in claim 1, it is characterised in that：The steel fibre is micro- for copper facing Steel fibre, cold drawn end hook steel fibre and shear one kind of undaform steel fibre.
A kind of 5. maintenance process of prefabricated member high-strength concrete of claim 1-4 any one of them, it is characterised in that bag Include following steps：Form removal after the concrete sample band mould precuring 24h prepared, the then steam curing under 80 DEG C of temperature conditionss 8h, finally inserts standard curing room maintenance 7d by test specimen.
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CN106495580B (en) * 2016-10-21 2019-05-28 长江宜昌航道工程局 A kind of steel fiber reinforced concrete structure water-permeable frame method for prefabricating
CN108996940A (en) * 2018-08-24 2018-12-14 上海市建筑科学研究院 A kind of high-intensitive admixture for prefabricated concrete members
CN110041041B (en) * 2019-05-29 2021-07-30 安徽富煌钢构股份有限公司 Assembled structural ultra-early-strength concrete and preparation method thereof
CN115745504A (en) * 2022-08-05 2023-03-07 武汉大学 Low-carbon emission green ultrahigh-performance concrete

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Publication number Priority date Publication date Assignee Title
CN101891503A (en) * 2010-07-27 2010-11-24 王高君 Novel environment-friendly method for refurbishing old ceramic tiles

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Publication number Priority date Publication date Assignee Title
CN101891503A (en) * 2010-07-27 2010-11-24 王高君 Novel environment-friendly method for refurbishing old ceramic tiles

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